Note: If I have not already corrected which of the twins is currently with Team Forest it is Solara. Luna is elsewhere.
Word of mages hidding in the back alleyways as sewers of Silver City reached Elric's wives in Dragon City Castle through the means of various communication networks established prior to the start of phase two of the expedition. It was the only way that they would agree with letting Luna essentially have a very long, not so romantic walk in the woods with her future husband.